Tax on deferred bonus

(Have used approximate numbers) In tax year 20/21 I received a deferred bonus award of £50,000, from which income tax of 40% was subtracted meaning £30,000 was invested into the company’s investment business. This matured during tax year 24/25 after satisfying various conditions where the £30,000 had grown to £45,000 and this was paid out. What tax should I then pay for 24/25 tax year, is it: a) I include this £45,000 on my taxable income for 24/25 but offset it with the £20,000 tax I had paid in 20/21 b) income tax on the £15,000 gain between 20/21 and 24/25 c) Capital gains tax on the £15,000 gain between 20/21 and 24/25 b) I include

Hi,
Unfortunately, we are unable to provide specific advice tailored to individual circumstances on this forum. This forum is for general queries only and is intended to help you self-serve. You are able to contact HMRC regarding your individual tax matters: 
https://www.gov.uk/government/organisations/hm-revenue-customs/contact/income-tax-enquiries-for-individuals-pensioners-and-employees
Alternatively, you may wish to engage the services of a professional advisor/accountant to assist with your enquiry.
Thank you.